Much debate surrounds the ''clothyard" shaft. Funny, there aren't many examples of them from Medieval times. Having examined the Mary Rose shafts myself in July of '07, none were anywhere near 36"... most being 30-31".
I don't believe we are that much different in stature than our medieval ancestors. Most of us can draw an arrow back to our ear with replica warbows, and that distance is about 30-32". I can't imagine drawing to 36", for anyone, being at all practical... and perhaps physically impossible. Funny, the arrows from the MR are not 36". If spoken of in those terms, it seems logical to assume that a clothyard is not 36in, but something less. I think that just because there was one bow long enough to shoot one, does not mean that they existed. That would be like saying that just because there were wheels during medieval times, that their vehicles should have been able to go 100 mph.
Practical warfare thrives by standardization. Making all the arrows, bullets, rifles, bows, kit, etc. the same for everyone makes practical sense. Therefore, all arrows can be shot by all bowmen.
Clothyard shafts, 200 pound bows, penetrating plate steel at 250 yards... all results of exaggeration and wishful thinking... perpetuated by legend, to become modern fact.